{"id":"mcode-m68","model_id":"M68 Analog Output, Immediate","name":"LinuxCNC M68 Analog Output, Immediate","summary":"M68 is a LinuxCNC G-code that sets an analog output immediately. It uses an E word for the output number and a Q word for the value, with Q set to 0 turning the output off. Because the output is applied immediately rather than queued with motion, it can break blending.","study_notes":["The document states that M68 functions the same as M64-M65.","M68 output happens immediately as received by the motion controller and is not synchronized with movement.","Immediate M68 output changes can break blending.","M68 will not function unless the appropriate motion.analog-out-nn pins are connected in the HAL file to outputs."],"safety_notes":["Output number E ranges from 0 to 3, adjustable with the motmod argument num_aio."],"sources":[{"url":"https://linuxcnc.org/docs/html/gcode/m-code.html#mcode:m68","title":"M-Codes","accessed":"2026-10-26"}],"verification":{"status":"source_checked","checked_at":"2026-10-26","values":7,"method":"llm_source_check"},"updated_at":"2026-10-26","type":"instruction","spec":{"language":"gcode","code":"M68","group":"Analog Output Control","syntax":"M68 E- Q-","parameters":[{"name":"E","description":"Output number ranging from 0 to 3; adjustable from the motmod argument num_aio."},{"name":"Q","description":"Value to set; set to 0 to turn the output off."}],"dialect":"LinuxCNC","related":[],"standards":[]},"url":"https://machineschema.com/instruction/mcode-m68","license":"https://creativecommons.org/licenses/by/4.0/"}